Spark-plug.



\F. DAVlS, 1R.

SPARK PLUG. `AA PILICAHON m55 MAY 4,1915.

L. l Patented Apr. 4, '1916.

an a "I t il STATE@ FRANK DAVIS, JR., OF DUQUOIN, ILLINOIS, ASSIGNOR OF ONE-HALF TO WESLEY H. MENG, OF DUQUOIN, ILLINOS.

SPARK-PLUG.

Specification of Letters latcnt.

Patented Apr. d,

`Application led May 4, 1915. Serial Isle-25,767.

To all ywhom it may concern:

Be it known that l, FRANK Davis, Jr., a citizen ot' the United States ot America, residing at luquoin. in the county of Perry and State oi Illinois, have invented new and useful lmproven'ients in Spark-Plugs, ,of which the following is a specification.

This invention .relates to certain novel and useful improvements in spark plugs for hydrocarbon engines.

In carrying' out the present invention, it is my purpose to provide a spark plug wherein the sparking terminals of the plug will be automatically cleaned on each up stroke of the engine piston, thereby preventing the accumulation ot carbon at the contact points and insuring the proper working ot the plug.

it also my purpose to provide a spark rein the sparking terminals ot the will be in axial alineni w h r and equipped with a fan-shaped. cleaning device rotatably mounted thereon and adapted to be revolved and moved ionn gitudinally during certain strokes of the engine piston with the el'ect to thoroughly clean the sparking terminals and remove any carbon or foreign matter therefrom.

With the aboveand other objects in View, the invention consists in the construction, combination and arrangement of parts hereinafter set forth in and falling within the scope of the claim.

n the accompanying drawing, Figure i lis a. view in side elevation of a spark plug constructed in accordance with the present invent1on. Fig. 2 1s an enlarged fragmentary longitudinal sectional view therethrough. iig'. 3 is a transverse sectional view through the same.

Referring' now to the drawing in detail,

l designates a spark plug which, in the present instance, embodies an outer metal casing 2 having one end externally screwthreaded to engage the threads on the wall of the opening in the engine cylinder, and an electrode holder 3 disposed Within the casing 2 and suitably secured therein and carrying the power electrode, the holder 3 being formed of porcelain or other suitable insulating material, as usual.

In accordance with my present invention,

a ground electrode l of substantially il shape has one limb secured to the cylinder end of the casing; 2 and the remaining limb dis]' osed in axialalinement with the power electrode 5 carried by the electrode holder 3. The limb of the U-shaped ground electrode e alining with the power electrode 5 is formed, adjacent to the central section of such ground electrode,vwith a shoulder' 6, and rotatably mounted upon the limb ot' the ground electrode alining with thel power electrode is a. hub 7 from which radiate ian blades 8.

ln practice, the pressure developed in the engine cylinder on each up stroke of the piston acts upon the fan blades 8 to rotate the latter and the hub 7 and move the hub 7and the fan blades longitudinally along the alininpr electrodes. In this rotary and lonfitudinal movement of the hub 7 and tan blades the Contact points are thoroughly and effectively cleaned, thereby removing carbon and other foreign matter from the points and maintaining the same in goed Working order.

While I have herein shown and describe the preferred form of my invention by way o-illustration, l wish it to be understood that l do not limit or confine myself to the precise details of construction herein described and delineated, as modification and variation may be made Within the scope of the claim without departing from the' spirit ofthe invention. i

I claim:

-A spark plug for hydro-carbon engines comprising a power electrode and a U- shaped ,L'round electrode having` one leg thereof alining axially with the power electrode and formed with a. shoulder, a hub rotatablyy mounted upon said. leg of the ground electrode and i ig upon said shoulder' and blades rat g from said hub substantially as and or the purpose described.

In testimony whereof l arlix my signature in presence of two witnesses.

FRANK Davis, JR.

Witnesses:

NILus G. SWAYnn, l/Vnsnny H. MENG. 

